Large textures, mipmaps and SystemInfo.maxTextureSize

Unity Engine
1

Suppose my game uses 4k-sq textures in many places. These are loaded from an assetbundle, where they have mipmaps.

Suppose further that the user is on a (probably Android) device that only supports 2k-sq textures (of which there seem to be plenty, even though they claim to support OpenGL ES3 and have bonkers high res displays…)

(1) When I load the 4k-sq Texture2D asset on these devices, will it just fail, or will it return me a 2k-sq texture based on the next mipmap?
(2) Is there any way to force devices to load from the next-mipmap down when loading a Texture2D, e.g. for the (many) Androd devices that only have 1.5Gb of memory but think they’re OpenGL ES3 and capable of 4k textures…

Obviously I can achieve the above by having multiple assets in the bundle, or variants of bundles, but that’s a load of complexity I’d really rather not manage when the data is already there anyway (because the second mipmap basically contains what I want.)

2

I should add that I know about QualitySettings.masterTextureLimit, and we used it in the past by setting it in a bootstrap scene (so 1 for crap devices and 0 for normal devices), then made sure the UI had no mipmaps so it stayed crisp. But in this case we’d really rather explicitly load using one mipmap down, and I think changing that setting at runtime will evict mipmaps, correct?

3

Hi!
(1) If the device doesn’t support 4K textures and you try to load one, it will fail.
(2) QualitySettings.masterTextureLimit is really what you want. It skips loading the higher mipmap levels.

1 Like
4

OK cool, we’ll go back to our old style with a Bootstrap scene to set masterTextureLimit, and making sure that the UI has no mipmaps.